Use `script.LocalValue` for arguments and `this`

[jrandolf-2]

According to the steps, script.LocalValue must include script.RemoteReference and script.ChannelValue. A priori, there is no purpose in script.ArgumentValue

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[jrandolf-2]

I think adding all these types to local-cddl is wrong; I don't think clients ever have to parse these values.

Sure, but CDDL complains about unknown types if you don't include it because LocalValue references it and LocalValue exists in local-cddl.

[jrandolf-2]

As discussed offline, the solution is to just make script.LocalValue only defined in remote.cddl.